travisluong

## poodir-notes.md

      
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              August 29, 2015 14:16
                — forked from speric/poodir-notes.md
            
          
    Chapter 1 - Object Oriented Design


The purpose of design is to allow you to do design later, and it's primary goal is to reduce the cost of change.

SOLID Design:

Single Responsibility Principle: a class should have only a single responsibility
Open-Closed Principle: Software entities should be open for extension, but closed for modification (inherit instead of modifying existing classes).
Liskov Substitution: Objects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.
Interface Segregation: Many client-specific interfaces are better than one general-purpose interface.


## application.html.erb
// layout file

<body>
    <div class="container">

      <%= flash_messages %>

      <%= yield %>
    </div><!-- /container -->
</body>
	// layout file

	<body>
	<div class="container">

	<%= flash_messages %>

	<%= yield %>
	</div><!-- /container -->
	</body>